The Princess of Wales is in an "incredible" position as the Royal Family would "collapse without her", according to a former royal butler.
Paul Burrell, who worked for Kate's late mother-in-law Princess Diana, believes the future of the family "rests" on her shoulders and that everything is "pinned up" by her.
Since the late Queen's death, Kate has seen her title change to Princess of Wales after husband Prince William was made Prince of Wales by his father King Charles.
The last person to use the Princess of Wales title was Diana - and Paul says there are some similarities between the two women.
Speaking on behalf of Slingo, he said: "Kate is in such an incredible position because it all rests on her really, the future rests on Kate and that’s an enormous responsibility because if she decided that she didn’t want to be a part of her marriage any more then I think the royal family would collapse.
"Everything is pinned up by Kate, the future is underpinned by Catherine Middleton and that’s incredible.
"Back in my day, the future seemed to be pinned on Diana Spencer, our future queen. Now we’re looking at another Princess of Wales who is in the same role that Diana had, married to a Prince of Wales and the future of the monarchy is down to her. It’s not an enviable position to be in."
Kate's last royal outing was on Monday when she and other senior royals joined the King for his first Commonwealth Day service as monarch at Westminster Abbey.
There were lots of sweet moments between the senior members of the family when they arrived at the event, exchanging small talk before the official procession to take their seats.
But body language expert Judi James believes Kate and William gave the most away with a series of fun and happy gestures during the hour-long service.
She told The Mirror: "The Prince and Princess of Wales were spotted exchanging some grins that were bordering on the flirtatious during the service.
"At one point Kate leant over to point to the place William should have been on his song sheet and he replied with a rather sweet suppressed smile, followed by a small bounce on his heels to signal a moment of happiness.
"Kate was also seen chatting to William during one of the musical numbers and his grin in reply looked equally cheeky."
